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use crate::payload::{Readable, Writeable};

#[repr(u8)]
pub enum TransactionTag {
    Nop,
    Transfer,
    Contract,
    Stake,
}

pub trait Transaction: Writeable + Readable {
    fn send_transaction(self) {
        let mut payload = vec![];
        self.write_to(&mut payload);

        unsafe {
            crate::sys::_send_transaction(self.tag() as u8, payload.as_ptr(), payload.len());
        }
    }

    fn tag(&self) -> TransactionTag;
}

pub struct Transfer {
    pub destination: [u8; 32],
    pub amount: u64,

    pub func_name: Vec<u8>,
    pub func_params: Vec<u8>,
}

impl Writeable for Transfer {
    fn write_to(&self, buffer: &mut Vec<u8>) {
        self.destination.write_to(buffer);
        self.amount.write_to(buffer);

        self.func_name.write_to(buffer);
        self.func_params.write_to(buffer);
    }
}

impl Readable for Transfer {
    fn read_from(buffer: &[u8], pos: &mut u64) -> Transfer {
        Transfer {
            destination: <[u8; 32]>::read_from(buffer, pos),
            amount: u64::read_from(buffer, pos),

            func_name: Vec::<u8>::read_from(buffer, pos),
            func_params: Vec::<u8>::read_from(buffer, pos),
        }
    }
}

impl Transaction for Transfer {
    fn tag(&self) -> TransactionTag {
        TransactionTag::Transfer
    }
}

pub struct Contract {
    pub code: Vec<u8>,
}

impl Writeable for Contract {
    fn write_to(&self, buffer: &mut Vec<u8>) {
        buffer.append(&mut self.code.clone());
    }
}

impl Readable for Contract {
    fn read_from(buffer: &[u8], pos: &mut u64) -> Contract {
        *pos = buffer.len() as u64;

        Contract {
            code: buffer.to_vec(),
        }
    }
}